Both brothers have been forced from the card due to injury,
Sherdog.com confirmed with a source close to the fighters on
Thursday. Danillo's opponent for the June 24 event, Antwain
Britt, has also reportedly suffered an injury, prompting
Strikeforce officials to remove the contest from the card.

Stepping up to face Yuri's opponent will be Ryan
LaFlare, as the undefeated welterweight now meets Travis Bush
in a preliminary contest. MMAJunkie first reported the change to
the event's lineup.

Sherdog.com has learned that Yuri underwent knee surgery on Monday.
According to a source close to the fighter, he will document his
recovery in a weekly video blog. Danillo injured his neck and spine
in training, but will not require surgery. With a few months of
rest, the middleweight is expected to recover fully.

Headlined by a lightweight clash between James Terry
and Caros Fodor,
Challengers 16 will emanate from the ShoWare Center in Kent, Wash.
The event will also feature the return of Ryan
Couture, as the son of “The Natural” locks horns with
undefeated lightweight Matt
Ricehouse. Additionally, powerful light heavyweight prospects
collide on June 24, as Gian
Villante meets Lorenz
Larkin. Rounding out the main draw will be a battle of
strikers, as Julia Budd
toes the line against Germaine
de Randamie in a 135-pound women's affair.

LaFlare will make his Strikeforce
debut at the event, as the New Yorker has fought exclusively for
the Ring of
Combat promotion throughout his three-year pro career. The
27-year-old has never been to a decision, finishing all six of his
career victims inside of two rounds. The welterweight most recently
fought one year ago at ROC 30, knocking out Mike
Medrano in the first frame.